linux-kernel - [PATCH 3.2 044/104] x86/cpufeatures: Add X86_BUG_SPECTRE

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Message-ID: <lsq.1520823814.503311824@decadent.org.uk>
Date:   Mon, 12 Mar 2018 03:03:34 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Rik van Riel" <riel@...hat.com>,
        "Andi Kleen" <ak@...ux.intel.com>,
        "David Woodhouse" <dwmw@...zon.co.uk>,
        "Tim Chen" <tim.c.chen@...ux.intel.com>,
        gnomes@...rguk.ukuu.org.uk,
        "Peter Zijlstra" <peterz@...radead.org>,
        "Linus Torvalds" <torvalds@...ux-foundation.org>,
        "Paul Turner" <pjt@...gle.com>, "Kees Cook" <keescook@...gle.com>,
        "Andy Lutomirski" <luto@...capital.net>,
        "Greg Kroah-Hartman" <gregkh@...ux-foundation.org>,
        "Jiri Kosina" <jikos@...nel.org>,
        "Dave Hansen" <dave.hansen@...el.com>,
        "Thomas Gleixner" <tglx@...utronix.de>
Subject: [PATCH 3.2 044/104] x86/cpufeatures: Add X86_BUG_SPECTRE_V[12]

3.2.101-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: David Woodhouse <dwmw@...zon.co.uk>

commit 99c6fa2511d8a683e61468be91b83f85452115fa upstream.

Add the bug bits for spectre v1/2 and force them unconditionally for all
cpus.

Signed-off-by: David Woodhouse <dwmw@...zon.co.uk>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: gnomes@...rguk.ukuu.org.uk
Cc: Rik van Riel <riel@...hat.com>
Cc: Andi Kleen <ak@...ux.intel.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Jiri Kosina <jikos@...nel.org>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Dave Hansen <dave.hansen@...el.com>
Cc: Kees Cook <keescook@...gle.com>
Cc: Tim Chen <tim.c.chen@...ux.intel.com>
Cc: Greg Kroah-Hartman <gregkh@...ux-foundation.org>
Cc: Paul Turner <pjt@...gle.com>
Link: https://lkml.kernel.org/r/1515239374-23361-2-git-send-email-dwmw@amazon.co.uk
[bwh: Backported to 3.2: assign the first available bug numbers]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 arch/x86/include/asm/cpufeature.h | 2 ++
 arch/x86/kernel/cpu/common.c      | 3 +++
 2 files changed, 5 insertions(+)

--- a/arch/x86/include/asm/cpufeature.h
+++ b/arch/x86/include/asm/cpufeature.h
@@ -215,6 +215,8 @@
 #define X86_BUG(x)		(NCAPINTS*32 + (x))
 
 #define X86_BUG_CPU_MELTDOWN	X86_BUG(0) /* CPU is affected by meltdown attack and needs kernel page table isolation */
+#define X86_BUG_SPECTRE_V1	X86_BUG(1) /* CPU is affected by Spectre variant 1 attack with conditional branches */
+#define X86_BUG_SPECTRE_V2	X86_BUG(2) /* CPU is affected by Spectre variant 2 attack with indirect branches */
 
 #if defined(__KERNEL__) && !defined(__ASSEMBLY__)
 
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -770,6 +770,9 @@ static void __init early_identify_cpu(st
 
 	if (c->x86_vendor != X86_VENDOR_AMD)
 		setup_force_cpu_bug(X86_BUG_CPU_MELTDOWN);
+
+	setup_force_cpu_bug(X86_BUG_SPECTRE_V1);
+	setup_force_cpu_bug(X86_BUG_SPECTRE_V2);
 }
 
 void __init early_cpu_init(void)